What do I need to rent a motorbike? What do I need?

You have to bring your identity card or your passport, a credit card for the deposit as well as your driving license. In Sapin it's allowed to drive up to 100cc motorbikes without any special license other than your normal car driving license. You just need a license which is valid for driving in Spain.

May I pay with my credit card?

Of course you can and it's even the best way.

Do I need any kind of deposit?
You may pay by credit card. In this last case it won't be charged to you unless any damage requires so.

May carry anyone in the motorbike?
The 100cc motorbikes can carry 2 people, in this case you will require a second helmet that costs 3€.